I'm not expert on this, but check this URL for a discussion of jetting:
formatting link
Best regards,Rob Housman
Hey everyone...havent posted here in quite a long time! With my '68
> Beetle getting stolen 9 months ago, I decided to replace it. Who can
> blame me! Here's my dilemma. I purchased the car from Seattle and I
> live in Aspen,CO. The car went from sea level to about 9100' in
> elevation. It idles just great but I loose significant power when I
> shift into 2nd gear and higher. I know with the lack of O2, I would
> see a decrease in power but this is very substantial. I havent made
> any adjustments to the carb, timing, etc. Anyone know where I should > begin?
> The engine is all stock except converted to 12V.
>
> Any help would be GREATLY appreciated!
> Jason